<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="userName" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.number="userAge" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="userSex">
        <option value="男" name="sex">男</option>
        <option value="女" name="sex">女</option>
      </select>
    </div>
    <div>
      <button @click="add">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0" v-if="arr.length > 0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in arr" :key="index">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.sex }}</td>
          <td>
            <button @click="del(index)">删除</button>
            <button @click="edit(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      userName: "",
      userAge: "",
      userSex: "",
      editIndex: null,
      arr: [
        {
          name: "Tom",
          age: 19,
          sex: "男",
        },
        {
          name: "Jone",
          age: 22,
          sex: "女",
        },
      ],
    };
  },
  methods: {
    add() {
      if (this.userName.length == 0 || this.userAge <= 0) {
        alert("请重新输入");
        return;
      }
      let newObj = {
        name: this.userName,
        age: this.userAge,
        sex: this.userSex,
      };
      if (this.editIndex !== null) {
        this.$set(this.arr, this.editIndex,newObj);
        this.editIndex=null
      }else{
         this.arr.push(newObj);
      }
     
    },
    del(index) {
      this.arr.splice(index, 1);
    },
    edit(index) {
      let editObj = this.arr[index];
      this.userName = editObj.name;
      this.userAge = editObj.age;
      this.userSex = editObj.sex;
      this.editIndex = index;
    },
  },
};
</script>
